Sack with automatic closing means



Dec. 12, 1933. R. JARRIER 1,938,593

SACK WITH AUTOMATIC CLOSING MEANS Filed May 1, 1928 2 Sheets-Sheet 1Iarner INVENTOR;

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Dec. 12, R JARRIER SACK WITH AUTOMATIC CLOSING MEANS Filed May 1, 1928 2Sheets-Sheet 2 z? 5 G B Xx. *Y X "21". y

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I *2.) Ammo Patented Dec. 12, 1933 1.9885883 sacx wrrn AUTOMATIC onosmomums I me man, St.-Qnentin. France M tation my 1, 1m. Serial No. time.and in France June 2, 1921 is calm The present invention relates toimprovements in bags of the self-closing type or so-called valve-bags i.e. bags provided with a filling opening formed between the wall 01 thebag and a portion lining said wall at this point so as to provide a pairof\lips or like elements which may be widened for inserting into theinterior of the bag a tube used for the filling operation, both saidlips being applied against each other under the weight of the materialcontained in the bag when the filling tube is removed. Bags of this kindmay be made of paper, cloth and generally of any material adapted to themanufacture of bags.

One object of the invention is to'provide such a bag that the fillingtube may be used for wholly supporting therbag during the fillingoperation. For this. purpose and according to the invention, the bag isprovided with at least two valves facing each other in such a mannerthat they may be passed through by the filling tube which may thussupport the whole weight of the bag.

Another object of the invention is to provide for the easy escape of theair contained in the bag during the filling operation as well as underthe effect of shocks to which the bag may be subjected when filled. Theabove mentioned arrangement of two valves facing each other greatlyfurthers the easyescape of the air, due to the fact that the walls arepulled downwardly by the weight of the material discharged into the bagand consequently a rather large opening will be formed between thelowest portion of the horizontal filling tube supporting the bag and thelower lip of each valve, whereby the air. may escape freely through saidopening. It will thus be possible to fill in a few seconds a bag adaptedto contain 50 kgs. of cement by means of a filling machine requiring buta small power. Heretofore, it was necessary to use a filling machinerequiring a great expense of power because no sufilcient means wasprovided for the escape of the air and consequently the latter wascompressed within the bag and counteracted the discharge of the materialout of the filling tube. On the other hand, the filled bag containsstill a certain amount of air which will cause the bursting out of thebag when it becomes suddenly compressed, for example under the effect ofa shock. In order to avoid this undesirable bursting, a tongue ofcorrugated pasteboard or similar element provided with a pluralityof'small channels is associated with one of the lips of the valves insuch a manner that said small channels open, on the one hand, in theinterior of the bag and,

(CL use-4) on the other hand, between said two lips whose close contactprovidesior the closing of the bag. In this manner, the bag will benormally thoroughly closed and when the air contained there in becomes.suddenly compressed, it will rush into the said channels and enterstangentially between the two lips which are thus readily spaced apart,whereby the air may freely escape outwardly. It draws with it but smalljets of material when the latter is-in the powder state and the burstingout of the bag is thus avoided. This effect is further increased by theprovision of similar devices at the end opposite the end provided withthe filling valves which former end is more particularly exposed tobursting because it forms thetop of the bag.

Other objects and characteristic features of the bag according to theinvention will appear from the following description given withreference to the annexed drawings, which show merely by way of example aform of bag manufactured according to the invention.

In the appended drawings which are given by way of example:

Fig. l is a perspective view of a sack with parts broken away showingthe air valve.

Fig. 2 is a section on the line 2--2 of Fig. 3.

Fig. 3 is a section on the line 3-3 of Fig. 2.

Figs. 4, 5, 6, 7, 8 and 9 show the sack in the diilerent stages of itsmanufacture, the paper tube being flattened upon itself according to theplane of the figure.

Figs. 10, 11, l2, l3 and 14 show in like manner the manufacture of theend of the bag opposite the end provided with the filling valves.

In the constructional form herein represented, the sack comprises paperwalls having the opening R S T U upon the small sides of which aremounted by suitable means two corrugated tongues I K L M each of whichextends for about 2 centimeters into the opening R S T U. The walls ofthe sack are folded on the lines R S and 'I' U and are turned down andpasted to a separate tongue F H P V which is folded on the line E G andis pasted to the part already folded.

It will be observed that by pressing upon the middle of the parts H F Yand G E X, the tongue F H P V will be sufilciently separated from thetongues I K L M to allow the insertion of a filling tube. When the sackhas been filled and the said tube removed, the material in the sack willpress the tongues I K L M against the end F H P V, thus closing thesack. The corrugations of the tongues are too small to allow thematerial to escape from the sack, but they allow the air to escape incase of shocks.

The sack is manufactured in the following manner, starting from acylindrical paper tube open at the ends and flattened diiwn.

First operation Fig. 4).-The sack is opened on the line XY fFigs. 4 and5) and the parts A X C and B Y D are folder. down.

Second opcratfon (Fig. 5) .The part E C D F is folded upon X Y E F, thejold being made on the line E F, and the part A G H B is folded upon X YG H, the fold being made on the line G H. In this manner an opening R ST U is formed through which the sack may be filled.

Third operation (Fig. 6).- The folds E F and G H being thus formed, theoperator inserts a strip of heavy paper, coated with paste, below R G ET; this strip projects from the line B T by about 2 centimeters, thepart thus extending at J K N L being corrugated; such corrugations arethe same as are employed for the corrugated pasteboard in current use. Alike strip is pasted in the same manner below S H U F.

Fourth operation Fig. 7).Between the lines E F and G H there is placed arectangular paper strip 0 P Q V whose width is 2 cm. less than thedistance between the lines E F and G'H, the end C Q being placed above HF. This paper strip, which is coated with paste on its upper side,covers the two strips I K L M.

Fifth operation (Fig. 8).The part A B G H is folded at G H A B upon thepaste-covered strip 0 Q P V, the fold'being made atG H; the part C D E Fis folded down upon E C D F.

Sixth operation (Fig. 9) .The partof the-strip O P Q V which projectsfrom the line E G- (Fig. 8) is folded down and pasted to the alreadyfolded parts E F C D and G H A B, folding along the line E G, and theend? V is placed at O Q.

This will afford a sack of the kind above specifled.

The two end parts of the sack may be formed as above described, or ifdesired, only one end may be thus formed, and the other end of the papertube is closed in such manner as to provide a lug by which the filledsack may be readily car-' ried, while leaving an opening for thedischarge of air.

The paper tube for the sack is placed flatwise, as before, and is foldedon the line X Y (Fig. 10), and it is then opened in such manner that thelines A B C D form a rectangle (Fig. 11). The operator then secures inany suitable manner under the triangular parts X A C and Y D B twotongues L consisting for example .of flexible pasteboard or likematerial which project respectively from the lines A C' and B D by a.suitable distance, and he then folds together the parts X A B Y and X CD Y (Fig. 12). He then places a paste-covered paper band of sufficientstrength R J W Z below the part X A B Y and on the line W Z (Fig..l3),and folds the said band about C D. upon the side X C D Y. -To provide agreater strength and to add to the pasting effect, the operator may makea horizontal row of stitches by ma chine on the K K line (Fig. 14) ormay place suitable clasps upon the said line.

The tongues L form valves by allowing the air to escape at the corners,and the sack can be readily seized by its strengthened part C D J R.

If the sack is to be tightly closed, it will suffice to employ but asingle tongue, and this may consist of a thick and very flexible sheetof paper which is not corrugated. Herein, as shown in Figs. 7 and 8, thepart 0 Q of the band 0 P Q V will exactly cover the part S H U E: theother end of the band 0 P Q V is triangular and it is applied and pastedupon the part H F Y, thus entirely closing the sack on that side. Only asingle opening is provided at G E for the insertion of a filling tube.When the filled sack is inverted, the internal tongue will fit upon theend portion formed by the hand 0 P Q V and will tightly close theopening.

Obviously, the said invention is not limited to the constructions hereindescribed and represented, which are given solely by way of example. Forinstance, the sack may comprise lat eral expanding or bellows portions,and herein the internal corner of the bellows must be folded out whenthe sack is to be opened on the line X Y (Fig. 5), and this arrangementis also comprised in the invention.

The corrugated tongues of the valve flaps K L in addition to providingchannels to allow the escape of air while preventing the escape of thecement or other contents of the bag, serve as cushioning means to absorbthe shock against the valve end of the bag during the handling of thebag when filled.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is:

1; In a valve bag made of material not allowing air to escapetherethrough and comprising at least a filling valve provided at one endof the bag, the provision of small air ducts in said end and arrangedopposite the filling valve, whereby the air still contained within thefilled bag will escape outwardly under the effect of a shock withoutcausing the bursting of said bag.

2. In a valve bag as claimed in claim 1, the further feature residing inthat said air ducts are formed between the walls of an inwardly tuckedcorner of said end and arranged opposite said filling valve, the twosides of the bag being attached together in the vicinity of the bottomof said inwardly tucked corner, whereby is provided both smallaperturesallowing escape of the air and a lug or grip for seizing the bag.

3. In a valve bag, the provision of a strip of corrugated material, i.e. of material provided with projections so as to form a plurality ofsmall rigid channels, attached to the filling opening and prolonging thesame inwardly, whereby the air contained within the bag may freelyescape through said channels while the sacked material is substantiallyprevented from escaping.

4. In a valve bag, the provision of a strip of corrugated material, i.e. of material provided with projections, so as to form a plurality ofsmall rigid channels, attached to the filling opening and prolonging thesame inwardly, and so disposed that said channels open in said fillingopening, whereby the air contained within the .bag may freely escapethrough said channels while the sacked material is substantiallyprevented from escaping.

5. In a valve bag, the provision of two valves, one of which hasthewalls thereof adapted to closely fit together so as to close the passageto substantially prevent the sacked material from escaping and the othervalve comprising a plurality of small channels leading into the interiorof the bag.

6. A valve bag comprising a tube, two inwardly folded corners on oneendof the tube, so as to form two opposite triangular fiaps, the transverseedges of the sides of the bag being tucked inwardly at substantially 90and secured together, a tongue of corrugated pasteboard secured undereach of said flaps in such a manner that the channels formed by saidcorrugations are disposed longitudinally of the valve and open in thespace between said fiaps and said tucked edges.

7. In a multi-ply bag of the class described having a satchel typebottom formed in one end and a valve provided in one end of the satchelbottom, the improvement which comprises a reinforcing strip extendingover the outer side of the side flaps of the satchel bottom andextending over the portion of the under side of said side fiaps whichconstitutes the upper wall of said valve.

8. In a multi-ply bag of the class described having a satchel typebottom having a filling valve in one end of said bottom, the improvementwhich comprises a strip folded over the outer edge of the top wall ofthe valve and pasted to the portions of the under and outer sides of theside flaps of the satchel bottom that constitutes the upper wall of thevalve.

9. In a multi-ply bag of the class described having a satchel typebottom formed on one of its ends and a valve in one end of the satchelbottom, the improvement which comprises a valve provided in the otherend of the satchel bottom, and a reinforcing strip folded over at leastone valve end of the side flaps and pasted to substantially the entireareas of the outer and inner sides of the valve flaps.

10. In a multi-ply bag of the class described having a satchel type ofbottom formed on one of its ends, the improvement which comprises areinforcing strip extending over the outer and inner sides of the sideflaps with the portion of the strip extending over the underside of theside flaps having its ends extending over portions of the top sides ofboth of the end flaps of the satchel bottom, said strip being secured tothe side flaps throughout substantially their length.

11. In a multi-ply bag of the class described having a satchel typebottom on one of its ends and a valve provided in one end of the satchelbottom, the improvement which comprises a reinforcing strip extendingover at least one side of the satchel bottom and attached to both of theside flaps thereof, one end of said strip constituting a portion of thetop wall of said valve.

12. In a multi-ply bag of the class described having one end providedwith a satchel type bottom and a valve provided in one end of thesatchel bottom, the improvement which comprises a valve formed in theother end of the satchel bottom, and a reinforcing strip pasted over theunderside of the satchel bottom and attached to both of the side flaps,the ends of said strip constituting portions of the top walls of saidvalves.

13. In a valve bag comprising a filling valve formed adjacent one end bya passageway between two lip-like members obtained by tucking the walls,a second valve substantially opposite the first one in order that asuitable filling tube may be inserted through both valves so that itwill serve at the same time to support the bag during 'the fillingoperation, and means for strengthening the bottom adjacent said valves,the improvement wherein the inner one of said lip-like members of eachvalve is formed by flaps obtained by tucking inwardly both corners of aflattened down tube and the outer one by the bottom of the bag formed bytucking inwardly at 9O the transverse edges of the sides of the bag andsecuring said edges together, the provision of a reinforcing strippassed through said passageways secured to the inner face of saidbottom, tucked back over and secured to the outer face of the bottom.

RENE JARRIER.

